package com.github.lokic.javaplus;

import com.github.lokic.javaplus.functional.consumer.Consumer2;

import com.github.lokic.javaplus.functional.consumer.Consumer3;

import com.github.lokic.javaplus.functional.consumer.Consumer4;

import java.util.ArrayList;

import java.util.List;

import java.util.function.Consumer;

import java.util.function.Supplier;

/**

* 对POJO提供的通用builder，也可以作为对POJO提供fluent风格的setter

*/

public class Builder<T> {

private final Supplier<T> instanceSupplier;

private final List<Consumer<T>> modifiers;

private Builder(Supplier<T> instanceSupplier) {

this.instanceSupplier = instanceSupplier;

this.modifiers = new ArrayList<>();

}

public static <T> Builder<T> of(Supplier<T> instanceSupplier) {

return new Builder<>(instanceSupplier);

}

public <P1> Builder<T> with(Consumer2<T, P1> consumer, P1 p1) {

Consumer<T> c = instance -> consumer.accept(instance, p1);

modifiers.add(c);

return this;

}

public <P1, P2> Builder<T> with(Consumer3<T, P1, P2> consumer, P1 p1, P2 p2) {

Consumer<T> c = instance -> consumer.accept(instance, p1, p2);

modifiers.add(c);

return this;

}

public <P1, P2, P3> Builder<T> with(Consumer4<T, P1, P2, P3> consumer, P1 p1, P2 p2, P3 p3) {

Consumer<T> c = instance -> consumer.accept(instance, p1, p2, p3);

modifiers.add(c);

return this;

}

public T build() {

T instance = instanceSupplier.get();

modifiers.forEach(modifier -> modifier.accept(instance));

return instance;

}

}